Supercharged magnetic pressure-limiting valve

Abstract

A supercharged magnetic pressure-limiting valve comprises an exhaust pipe and a fixing part arranged at the lower end of the exhaust pipe, and a valve body coaxial with the exhaust pipe is arranged over the exhaust pipe. An exhaust groove is formed in the center of the lower surface of the valve body, and the upper end of the exhaust pipe penetrates into the exhaust groove; a plurality of exhaust holes communicated with the exhaust groove are formed in the outer wall of the lower end of the valve body; a magnetic steel mounting groove is formed in the center of the bottom of the exhaust groove; magnetic steel matched with the magnetic steel mounting groove is arranged in the magnetic steel mounting groove; a telescopic hole is formed in the center of the magnetic steel; a magnetic field induction steel column is arranged in the telescopic hole; the lower end of the magnetic field induction steel column downwards penetrates through the telescopic hole and blocks and seals a pipe opening in the upper end of the exhaust pipe; a pressurizing structure is arranged in the center of the valve body. The supercharged magnetic pressure-limiting valve not only can ensure that gas in the pressure cooker can be stably discharged, but also can change the working pressure value of the pressure cooker when the gas is discharged according to the cooking requirement, so that the pressure-limiting and pressurizing effects are achieved.

Description

Technical Field

[0001] The utility model relates to the field of pressure limiting valves, in particular to a supercharging magnetic pressure limiting valve. Background Art

[0002] A pressure limiting valve is a pressure limiting device used on a pressure cooker. When the pressure in the pressure cooker reaches the working pressure during heating, the pressure limiting valve exhausts gas through the exhaust hole to prevent the pressure from rising continuously, thereby achieving the purpose of cooking.

[0003] In the actual cooking process, the required working pressure values for different foods are different. However, the traditional pressure limiting valve can only provide a relatively constant working pressure value. When a larger working pressure value is needed, a new pressure limiting valve has to be replaced. This method of changing pressure not only has a high cost, but also during the actual replacement process of the pressure limiting valve, due to the different specifications of the pressure limiting valves, it is extremely difficult for the user to determine whether the newly replaced pressure limiting valve is compatible with their own pressure cooker. If it is not compatible, accidents are very likely to occur, posing serious safety hazards. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a supercharging magnetic pressure limiting valve, which can not only ensure that the gas in the pressure cooker can be stably discharged, but also change the working pressure value when the pressure cooker discharges gas according to the cooking requirements, achieving the effects of pressure limiting and supercharging.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0006] The utility model discloses a supercharging magnetic pressure limiting valve, which includes an exhaust pipe and a fixing part arranged at the lower end of the exhaust pipe. A valve body coaxial with the exhaust pipe is arranged directly above the exhaust pipe. A discharge groove is arranged at the center of the lower surface of the valve body, and the upper end of the exhaust pipe penetrates into the discharge groove. A plurality of exhaust holes communicating with the discharge groove are arranged on the outer wall of the lower end of the valve body. A magnet installation groove is arranged at the center of the bottom of the discharge groove. A magnet matching the magnet installation groove is arranged in the magnet installation groove. A telescopic hole is arranged at the center of the magnet. A magnetic field induction steel column is arranged in the telescopic hole. The lower end of the magnetic field induction steel column passes downward through the telescopic hole and plugs and seals the upper end pipe orifice of the exhaust pipe. A supercharging structure is arranged at the center of the valve body, and the supercharging structure can switch the force value required to open the upper end pipe orifice of the exhaust pipe. A positioning structure matching the magnet is arranged on the exhaust pipe, and the positioning structure can adsorb the valve body on the exhaust pipe.

[0007] The boosting structure also includes a movable hole arranged in the center of the upper surface of the valve body; an adjustment hole communicating with the movable hole is arranged at the center of the bottom of the magnetic steel mounting groove; the diameter of the adjustment hole is larger than the diameter of the movable hole; a push rod matching it is arranged in the movable hole; the lower end of the push rod is inserted downward into the adjustment hole and fits with the upper end surface of the magnetic field induction steel column; an annular limiting portion is arranged on the outer wall of the lower end of the push rod; a set of boosting springs outside the push rod is arranged between the upper surface of the limiting portion and the upper inner wall of the adjusting hole; the upper end of the push rod is inserted upward to the outside of the movable hole and is provided with a gear adjustment structure; the gear adjustment structure can move the push rod upward and fix it, so that there is a movable spacing between the lower end surface of the push rod and the upper end surface of the magnetic field induction steel column.

[0008] There are gaps between the outer wall of the limiting part and the inner wall of the adjusting hole, and between the outer wall of the push rod and the inner wall of the movable hole.

[0009] The shifting structure includes an oblong hole arranged at the upper end of the push rod; a shifting block is provided above the center of the upper surface of the valve body; the length of the shifting block is greater than the height of the shifting block; a limiting notch is provided at the lower right corner of the shifting block, and the length of the limiting notch is greater than the height of the limiting notch; the upper end of the push rod is inserted upward into the limiting notch; a pin is provided in the limiting notch, the pin passes through the oblong hole, and the pin is fitted with the upper inner wall of the oblong hole; a toggle portion is provided on the upper surface of the left end of the shifting block; a guide arc surface is provided on the lower right corner edge of the shifting block.

[0010] The positioning structure includes a positioning seat arranged on the upper outer wall of the exhaust pipe; an annular suction positioning groove is arranged on the upper surface of the positioning seat, and the suction positioning groove is opposite to the magnetic steel; a steel ring matching with the suction positioning groove is arranged in the suction positioning groove.

[0011] The upper notch edge of the suction positioning groove is fitted on the upper surface of the steel ring by riveting; the lower notch edge of the magnetic steel installation groove is fitted on the lower surface of the magnetic steel by riveting.

[0012] The outer wall of the positioning seat is provided with an annular sealing step, which is lower than the upper surface of the positioning seat; the lower surface of the valve body is in contact with the sealing step; the outer wall of the positioning seat is provided with a guiding cone surface which is narrow at the top and wide at the bottom.

[0013] An auxiliary conical surface which is narrow at the top and wide at the bottom is arranged on the inner wall of the opening at the lower end of the telescopic hole.

[0014] The pipe opening at the upper end of the exhaust pipe has a sealing cone surface which is wide at the top and narrow at the bottom.

[0015] The lower end surface of the magnetic field sensing steel column is provided with a ball receiving groove; a ball is placed in the ball receiving groove; the lower end of the ball protrudes downward to the outside of the ball receiving groove and blocks and seals the upper end of the exhaust pipe.

[0016] The fixing part at the lower end of the exhaust pipe passes downward through a pot lid and is screwed with a nut that fits against the lower surface of the pot lid. The lower surface of the positioning seat fits against the upper surface of the pot lid. An annular sealing groove is provided on the lower surface of the positioning seat. A rubber ring matching the sealing groove is provided in the sealing groove.

[0017] The beneficial effects of the present utility model are as follows:

[0018] Compared with the prior art, for the pressure - increasing type magnetic pressure - limiting valve adopting the structure of the present utility model, only by rotating the gear - adjusting block, the pressure - limiting valve can be switched between the ordinary pressure - limiting mode and the pressure - increasing mode. In the ordinary pressure - limiting mode, as the magnetic - field - sensing steel column moves upward, the high - pressure gas discharged upward through the exhaust pipe only needs to resist the magnetism from the magnetic steel, and the force value required to open the upper end pipe orifice of the exhaust pipe becomes smaller. At the same time, the actual pressure value inside the pressure cooker also becomes smaller. In the pressure - increasing mode, the high - pressure gas discharged upward through the exhaust pipe needs to resist both the magnetism from the magnetic steel and the elastic force of the pressure - increasing spring, and the force value required to open the upper end pipe orifice of the exhaust pipe becomes larger. At the same time, the actual pressure value inside the pressure cooker also becomes larger, thereby achieving the effects of pressure - increasing and pressure - limiting. There is no need to change a new pressure - limiting valve to change the actual pressure of the pressure cooker, effectively avoiding the situation that the new pressure - limiting valve does not conform to the actual specifications of the pressure cooker, resulting in the inability to discharge the gas pressure normally and causing an explosion, and effectively eliminating potential safety hazards. Description of the Drawings

[0019] Figure 1 is a sectional view of the pressure - increasing type magnetic pressure - limiting valve of the present utility model in the pressure - increasing mode;

[0020] Figure 2 is a sectional view of the pressure - increasing type magnetic pressure - limiting valve of the present utility model in the ordinary pressure - limiting mode;

[0021] Figure 3 is a structural schematic diagram of the pressure - increasing type magnetic pressure - limiting valve of the present utility model in the ordinary pressure - limiting mode. Detailed Description of the Invention

[0022] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0023] Please refer to Figures 1 to 3The utility model provides a boosting magnetic pressure limiting valve, comprising an exhaust pipe 1, a fixing part 2 arranged at the lower end of the exhaust pipe 1, a valve body 3 coaxial with the exhaust pipe 1 is arranged just above the exhaust pipe 1; an exhaust groove 4 is arranged at the center of the lower surface of the valve body 3, and the upper end of the exhaust pipe 1 penetrates into the exhaust groove 4; a plurality of exhaust holes 5 intersecting with the exhaust groove 4 are arranged on the outer wall of the lower end of the valve body 3; a magnetic steel mounting groove 6 is arranged at the center of the bottom of the exhaust groove 4; a magnetic steel 7 matching with it is arranged in the magnetic steel mounting groove 6; a telescopic hole 10 is arranged at the center of the magnetic steel 7; a magnetic field induction steel column 23 is arranged in the telescopic hole 10; the lower end of the magnetic field induction steel column 23 passes through the telescopic hole 10 downwardly and blocks and seals the upper end of the exhaust pipe; a boosting structure is provided in the center of the valve body 3, and the boosting structure can switch the force value required to open the upper end of the exhaust pipe; a positioning structure matching with the magnetic steel 7 is provided on the exhaust pipe 1, and the positioning structure can adsorb the valve body on the exhaust pipe 1.

[0024] The boost structure also includes a movable hole 904 arranged at the center of the upper surface of the valve body 3; an adjustment hole 905 is arranged at the center of the bottom of the magnetic steel installation groove 6 and is connected with the movable hole 904; the diameter of the adjustment hole 905 is larger than the diameter of the movable hole 904; a matching push rod 906 is arranged in the movable hole 904; the lower end of the push rod 906 is downwardly penetrated into the adjustment hole 905 and fits with the upper end surface of the magnetic field induction steel column 23; an annular limiting portion 907 is arranged on the outer wall of the lower end of the push rod 906; a boost spring 908 is arranged outside the push rod 906 between the upper surface of the limiting portion 907 and the upper inner wall of the adjustment hole 905; the upper end of the push rod 906 is upwardly penetrated to the outside of the movable hole 904 and is provided with a gear adjustment structure; the gear adjustment structure can move the push rod 906 upward and fix it, so that there is a movable spacing 909 between the lower end surface of the push rod 906 and the upper end surface of the magnetic field induction steel column 23.

[0025] There are gaps between the outer wall of the limiting portion 907 and the inner wall of the adjusting hole 905 , and between the outer wall of the push rod 906 and the inner wall of the movable hole 904 .

[0026] The shifting structure includes an oblong hole 801 arranged at the upper end of the push rod 906; a shifting block 802 is provided above the center of the upper surface of the valve body 3; the length of the shifting block 802 is greater than the height of the shifting block 802; a limiting notch 803 is provided at the lower right corner of the shifting block 802, and the length of the limiting notch 803 is greater than the height of the limiting notch 803; the upper end of the push rod 906 is inserted upward into the limiting notch 803; a pin 804 is provided in the limiting notch 803, the pin 804 passes through the oblong hole 801, and the pin 804 is in contact with the upper inner wall of the oblong hole 801; a toggle portion 805 is provided on the upper surface of the left end of the shifting block 802; a guiding arc surface 806 is provided on the lower right corner edge of the shifting block 802.

[0027] The positioning structure includes a positioning seat 11 provided on the outer wall of the upper part of the exhaust pipe 1; an annular suction positioning groove 12 is provided on the upper surface of the positioning seat 11, and the suction positioning groove 12 faces the magnet 7; a steel ring 13 matching the suction positioning groove 12 is provided in the suction positioning groove 12.

[0028] The edge of the upper side slot opening of the suction positioning groove 12 is press-fitted onto the upper surface of the steel ring 13; the edge of the lower side slot opening of the magnet mounting groove 6 is press-fitted onto the lower surface of the magnet 7.

[0029] An annular sealing step 14 is provided on the outer wall of the positioning seat 11, and the sealing step 14 is lower than the upper surface of the positioning seat 11; the lower surface of the valve body 3 is fitted with the sealing step 14; a guiding conical surface 15 with a narrow upper part and a wide lower part is provided on the outer wall of the positioning seat 11.

[0030] An auxiliary conical surface 16 with a narrow upper part and a wide lower part is provided on the inner wall of the lower end hole opening of the telescopic hole 10.

[0031] The upper end pipe orifice of the exhaust pipe 1 has a sealing conical surface 17 with a wide upper part and a narrow lower part.

[0032] A sphere receiving groove 24 is provided on the lower end surface of the magnetic field induction steel column 23; a sphere 25 is placed in the sphere receiving groove 24; the lower end of the sphere 25 protrudes downward out of the sphere receiving groove 24 and blocks and seals the upper end pipe orifice of the exhaust pipe 1.

[0033] The fixing part at the lower end of the exhaust pipe 1 passes downward through a pot lid 18 and is screwed with a nut 19 that fits the lower surface of the pot lid 18, and the lower surface of the positioning seat 11 fits the upper surface of the pot lid 18; an annular sealing groove 20 is provided on the lower surface of the positioning seat 11; a rubber ring 21 matching the sealing groove 20 is provided in the sealing groove 20.

[0034] The usage method of the present utility model is as follows:

[0035] When the toggle portion 805 is facing upward, the pressure limiting valve is in a boost mode. When high-pressure gas is generated during the use of the pressure cooker, the gas will be discharged upward through the exhaust pipe 1 on the pot cover 18. At this time, the high-pressure gas will push the ball 25 upward, thereby realizing the upward movement of the magnetic field induction steel column 23. Since the magnetic field induction steel column 23 is in the telescopic hole 10 at the center of the magnetic steel 7, the magnetic field induction steel column will still be attracted by the magnetic field after moving under the influence of the magnetic field of the magnetic steel 7. When the external force is lost, the magnetic field induction steel column 23 will automatically reset under the action of the magnetic field. As the ball 25 pushes the magnetic field induction steel column 23 upward, the upper end surface of the magnetic field induction steel column 23 is in contact with the lower end surface of the push rod 906. When the magnetic field sensing steel column 23 moves upward, the push rod 906 and the limit part 907 move upward synchronously. When the limit part 907 moves upward, the boost spring 908 will be compressed and generate elastic force, and this elastic force will act on the sphere 25 through the magnetic field sensing steel column 23. Therefore, the high-pressure gas discharged from the upper end of the exhaust pipe 1 needs to counteract the magnetism of the magnetic steel 7 and the elastic force of the boost spring 908 at the same time. As the sphere 25 moves upward and leaves the upper end of the exhaust pipe 1 under the action of the high-pressure gas, the upper end of the exhaust pipe 1 is in an open state, and the high-pressure gas can be discharged into the exhaust groove 4 through the upper end of the exhaust pipe 1, and finally discharged to the outside from the exhaust hole 5 to realize gas discharge.

[0036] When the pressure limiting valve needs to be switched to the normal pressure limiting mode, the shift block 802 can be rotated by the toggle portion 805. As the shift block 802 rotates clockwise around the pin 804, the guide arc surface 806 can play a guiding role, making the rotation process of the shift block 802 smoother. When the shift block 802 is rotated ninety degrees clockwise, the toggle portion 805 faces right. At this time, the original right side wall of the shift block 802 is in contact with the upper surface of the valve body 3, and the position of the push rod 906 is fixed. Since the length of the shift block 802 is greater than the height of the shift block 802, when the shift block 802 is rotated ninety degrees clockwise, the actual height of the pin 804 becomes higher, so that the pressure applied by the pin 804 to the upper inner wall of the oblong hole 801 causes the push rod 906 to move upward. 06 moves upward, the limiting portion 907 compresses the boosting spring 908 upward, so that there is an active gap 909 between the lower end surface of the push rod 906 and the upper end surface of the magnetic field sensing steel column 23. The existence of the active gap 909 makes it unnecessary to push the push rod 906 upward synchronously when the magnetic field sensing steel column 23 is pushed up by the sphere 25, so the elastic force of the boosting spring 908 will not be applied to the sphere 25 in the end. At this time, the high-pressure gas discharged upward through the upper end of the exhaust pipe 1 only needs to resist the magnetism from the magnetic steel 7. As the force that needs to be resisted decreases, the actual upward stroke of the sphere 25 will become larger, the upper end of the exhaust pipe 1 will open more widely, and the gas flow rate actually discharged from the upper end of the exhaust pipe 1 will be greater. As the discharged gas flow rate increases, the actual pressure inside the pressure cooker will decrease.

[0037] As described above, for the present utility model, by simply rotating the gear adjustment block 802, the pressure limiting valve can be switched between the normal pressure limiting mode and the supercharging mode. In the normal pressure limiting mode, as the magnetic field induction steel column 23 moves upward, the high-pressure gas discharged upward through the exhaust pipe 1 only needs to resist the magnetism from the magnet 7, and the force value required to open the upper end nozzle of the exhaust pipe 1 becomes smaller. At the same time, the actual pressure value inside the pressure cooker also becomes smaller. In the supercharging mode, the high-pressure gas discharged upward through the exhaust pipe 1 needs to resist both the magnetism from the magnet 7 and the elastic force of the supercharging spring 908, and the force value required to open the upper end nozzle of the exhaust pipe 1 becomes larger. At the same time, the actual pressure value inside the pressure cooker also becomes larger, thereby achieving the effects of supercharging and pressure limiting. There is no need to change a new pressure limiting valve to change the actual pressure of the pressure cooker, effectively avoiding the situation where the new pressure limiting valve does not conform to the actual specifications of the pressure cooker, resulting in abnormal discharge of gas pressure and explosion, and effectively eliminating potential safety hazards.

[0038] There are gaps between the outer wall of the limiting part 907 and the inner wall of the adjustment hole 905, and between the outer wall of the ejector rod 906 and the inner wall of the movable hole 904. The existence of the gaps is conducive to the normal flow of gas. This structural design can effectively avoid the situation where the space between the upper surface of the limiting part 907 and the upper side inner wall of the adjustment hole 905 is squeezed when the ejector rod 906 moves upward, resulting in an increase in internal pressure, and thus effectively avoid the situation where the air pressure between the upper surface of the limiting part 907 and the upper side inner wall of the adjustment hole 905 becomes too large, causing the ejector rod 906 to fail to move upward normally.

[0039] A pin 804 is provided in the limit notch 803. The pin 804 passes through the long circular hole 801, and the pin 804 is in contact with the upper side inner wall of the long circular hole 801. To facilitate the installation of the pin 804, installation holes 22 matching the pin 804 can be provided on the front and rear side walls of the gear adjustment block 802, and the installation holes 22 communicate with the limit notch 803.

[0040] The positioning structure includes a positioning seat 11 provided on the upper outer wall of the exhaust pipe 1. An annular suction positioning groove 12 is provided on the upper surface of the positioning seat 11. The suction positioning groove 12 faces the magnet 7. A steel ring 13 matching the suction positioning groove 12 is provided in the suction positioning groove 12. The steel ring 13 and the magnet 7 attract each other to generate a suction force. This suction force can firmly fit the surface of the valve body 3 on the sealing step 14, effectively ensuring the sealing performance between the lower surface of the valve body 3 and the sealing step 14. The suction force between the magnet 7 and the steel ring 13 is greater than the pressure of the gas discharged upward through the exhaust pipe 1 by the pressure cooker. Therefore, there is no need to worry about the valve body 3 falling off during the exhaust of the exhaust pipe 1, ensuring the stability and safety during exhaust.

[0041] The upper edge of the slot opening on the upper side of the suction and positioning groove 12 is press riveted and fitted to the upper surface of the steel ring 13, and the lower edge of the slot opening on the lower side of the magnet installation groove 6 is press riveted and fitted to the lower surface of the magnet 7. This fixing method not only facilitates the initial assembly of the magnet 7 and the steel ring 13, but also ensures the stability of the magnet 7 and the steel ring 13 in the later stage, effectively avoiding the situation where the magnet 7 disengages from the magnet installation groove 6 under the suction force between itself and the steel ring 13, and effectively avoiding the situation where the steel ring 13 disengages from the suction and positioning groove 12 under the suction force between itself and the magnet 7.

[0042] The outer wall of the positioning seat 11 is provided with a guiding conical surface 15 that is narrower at the top and wider at the bottom. The presence of the guiding conical surface 15 facilitates the positioning seat 11 to be inserted into the exhaust groove 4 as the exhaust pipe is clamped, effectively improving the assembly efficiency.

[0043] The inner wall of the lower end orifice of the telescopic hole 10 is provided with an auxiliary conical surface 16 that is narrower at the top and wider at the bottom. The presence of the auxiliary conical surface 16 can reduce the actual contact area between the outer wall of the magnetic field induction steel column 23 and the inner wall of the telescopic hole 10, and improve the smoothness when the magnetic field induction steel column 23 moves along the trajectory of the telescopic hole 10.

[0044] The upper end orifice of the exhaust pipe 1 has a sealing conical surface 17 that is wider at the top and narrower at the bottom. When the lower end of the magnetic field induction steel column 23 directly seals the upper end orifice of the exhaust pipe 1, as long as the edge of the lower end surface of the magnetic field induction steel column 23 fits with the sealing conical surface 17, the upper end orifice of the exhaust pipe 1 can be blocked. When sealed by the sphere 25, the presence of the sealing conical surface 17 is more conducive to quickly blocking and sealing the upper end orifice of the exhaust pipe 1 when the sphere 25 moves down and resets.

[0045] The fixing part at the lower end of the exhaust pipe 1 passes downward through a pot lid 18 and is screwed with a nut 19 that fits against the lower surface of the pot lid 18. The lower surface of the positioning seat 11 fits against the upper surface of the pot lid 18. This fixing method facilitates the disassembly and assembly of the exhaust pipe 1, thus facilitating the maintenance and replacement of the exhaust pipe 1.

[0046] The lower surface of the positioning seat 11 is provided with an annular sealing groove 20, and a rubber ring 21 that matches it is provided in the sealing groove 20. The presence of the rubber ring 21 can effectively improve the sealing performance between the lower surface of the positioning seat 11 and the upper surface of the pot lid 18, effectively ensuring the sealing performance when the exhaust pipe 1 is installed and fixed on the pot lid 18, thereby avoiding air leakage and effectively ensuring the stability of the internal air pressure of the pressure cooker during use.

Claims

1. A supercharged magnetic pressure limiting valve, comprising an exhaust pipe and a fixed part provided at the lower end of the exhaust pipe, characterized in that: A valve body coaxial with the exhaust pipe is provided directly above the exhaust pipe; an exhaust groove is provided in the center of the lower surface of the valve body, and the upper end of the exhaust pipe is inserted into the exhaust groove; a plurality of exhaust holes in communication with the exhaust groove are provided on the outer wall of the lower end of the valve body; a magnetic steel mounting groove is provided in the center of the bottom of the exhaust groove; a magnetic steel matching with the magnetic steel mounting groove is provided in the magnetic steel mounting groove; a telescopic hole is provided in the center of the magnetic steel; a magnetic field induction steel column is provided in the telescopic hole; the lower end of the magnetic field induction steel column passes downward through the telescopic hole and blocks and seals the upper end of the exhaust pipe; a boosting structure is provided in the center of the valve body, and the boosting structure can switch the force value required to open the upper end of the exhaust pipe; a positioning structure matching with the magnetic steel is provided on the exhaust pipe, and the positioning structure can adsorb the valve body on the exhaust pipe.

2. The supercharged magnetic pressure limiting valve according to claim 1, characterized in that: The boosting structure also includes a movable hole arranged in the center of the upper surface of the valve body; an adjustment hole communicating with the movable hole is arranged at the center of the bottom of the magnetic steel mounting groove; the diameter of the adjustment hole is larger than the diameter of the movable hole; a push rod matching it is arranged in the movable hole; the lower end of the push rod is inserted downward into the adjustment hole and fits with the upper end surface of the magnetic field induction steel column; an annular limiting portion is arranged on the outer wall of the lower end of the push rod; a set of boosting springs outside the push rod is arranged between the upper surface of the limiting portion and the upper inner wall of the adjusting hole; the upper end of the push rod is inserted upward to the outside of the movable hole and is provided with a gear adjustment structure; the gear adjustment structure can move the push rod upward and fix it, so that there is a movable spacing between the lower end surface of the push rod and the upper end surface of the magnetic field induction steel column.

3. The supercharged magnetic pressure limiting valve according to claim 2, characterized in that: There are gaps between the outer wall of the limiting part and the inner wall of the adjusting hole, and between the outer wall of the push rod and the inner wall of the movable hole.

4. The supercharged magnetic pressure limiting valve according to claim 2, characterized in that: The shifting structure includes an oblong hole arranged at the upper end of the push rod; a shifting block is provided above the center of the upper surface of the valve body; the length of the shifting block is greater than the height of the shifting block; a limiting notch is provided at the lower right corner of the shifting block, and the length of the limiting notch is greater than the height of the limiting notch; the upper end of the push rod is inserted upward into the limiting notch; a pin is provided in the limiting notch, the pin passes through the oblong hole, and the pin is fitted with the upper inner wall of the oblong hole; a toggle portion is provided on the upper surface of the left end of the shifting block; a guide arc surface is provided on the lower right corner edge of the shifting block.

5. The supercharged magnetic pressure limiting valve according to claim 1, wherein: The positioning structure includes a positioning seat arranged on the upper outer wall of the exhaust pipe; an annular suction positioning groove is arranged on the upper surface of the positioning seat, and the suction positioning groove is opposite to the magnetic steel; a steel ring matching with the suction positioning groove is arranged in the suction positioning groove.

6. The supercharged magnetic pressure limiting valve according to claim 5, wherein: The upper notch edge of the suction positioning groove is fitted on the upper surface of the steel ring by riveting; the lower notch edge of the magnetic steel installation groove is fitted on the lower surface of the magnetic steel by riveting.

7. The supercharged magnetic pressure limiting valve according to claim 5, characterized in that: The outer wall of the positioning seat is provided with an annular sealing step, which is lower than the upper surface of the positioning seat; the lower surface of the valve body is in contact with the sealing step; the outer wall of the positioning seat is provided with a guiding cone surface which is narrow at the top and wide at the bottom.

8. The supercharged magnetic pressure limiting valve according to claim 1, characterized in that: An auxiliary conical surface which is narrow at the top and wide at the bottom is arranged on the inner wall of the opening at the lower end of the telescopic hole.

9. The supercharged magnetic pressure limiting valve according to claim 1, characterized in that: The pipe opening at the upper end of the exhaust pipe has a sealing cone surface which is wide at the top and narrow at the bottom.

10. The supercharged magnetic pressure limiting valve according to claim 1, characterized in that: The lower end surface of the magnetic field sensing steel column is provided with a ball receiving groove; a ball is placed in the ball receiving groove; the lower end of the ball protrudes downward to the outside of the ball receiving groove and blocks and seals the upper end of the exhaust pipe.

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